Lib Dems Offer Tax Cuts, Staking Them on EU Economic Growth

The UK Liberal Democrats closed their annual conference in Brighton with a headline-grabbing fiscal policy announcement: billions of pounds in tax cuts aimed not only at lower-income groups but also at those in the 40% tax bracket. Lib Dem leader Sir Ed Davey presented the promise as an effort to attract voters who have tended to support the Conservative Party, while stressing that it would be funded by economic growth that he believes would emerge if the UK rejoined the European Union’s Single Market and customs union.

The move marked a shift in tone at this year’s Lib Dem conference. The theatrical stunts that usually enliven the event—from falling off a paddleboard to riding a roller coaster—were scaled back. Davey repeatedly called this “the fight of our lives,” with the main focus on Reform UK. But he saved one big announcement for his closing speech: tax cuts that, by the party’s calculations, would cost £17 billion.

What sets the Lib Dems apart from Reform UK—which has also proposed raising the tax-free income threshold—is where the funding comes from. Reform UK, under Nigel Farage, plans to cut welfare spending to cover the cost of tax cuts. Davey rejects that approach and instead chooses to rely on economic growth from reintegration with the European Union. The Lib Dems thus place Brussels at the heart of their fiscal policy, a sharp contrast with the Conservative Party, which is also committed to cutting welfare and supporting Brexit.

But the plan carries major risks. The Lib Dems insist that a deal with the EU can be negotiated within a year if they are in power after the next election. Some economists, including the Office for Budget Responsibility (OBR), believe that Single Market membership can boost UK economic growth. However, political history shows that negotiations with the EU are often more complicated than party leaders imagine. Moreover, basing tax cuts on future economic growth projections is a speculative move.

The uncertainty is further reinforced by an assessment from the Institute for Fiscal Studies (IFS), an independent think tank. The IFS said the policies set out in the Lib Dem press release would cost “far more” than the £17 billion budgeted. The party also acknowledges that the new tax cuts would not take effect until the fifth year after the next election. That means even if the Lib Dems win the election and successfully negotiate a deal with the EU, the tax cuts could not be enjoyed until around eight years from now.

Despite the doubts, the political message delivered by Davey appears to have quelled internal criticism. Before the conference, several MPs from his party openly questioned the direction and ambition of his leadership. But after the speech, one previously skeptical MP said it was the speech they had been waiting for. Nevertheless, a minority remain uncomfortable because the party’s flagship policy is a tax cut that benefits wealthier groups more. One MP even hoped the focus would shift to young voters by reducing the student loan burden.

The Lib Dem strategy is now focused on 27 seats where they finished second in the 2024 election, most of them held by the Conservative Party. Davey’s tax cuts are designed to woo voters in those areas. But the Conservative Party has already launched an attack, calling the Lib Dems the “lapdog of the Labour Party.” The attack comes because Davey explicitly refuses to form a coalition with the Conservative Party and Reform UK after the next election, but has not ruled out working with Labour.

With the 72 seats won at the last election—a record for the Lib Dems—the party left Brighton with high confidence. Davey stressed that there is no upper limit to his ambition. He once served in a coalition government with the Conservatives under David Cameron, and now his eyes are on a second term in power. The question is whether this promise of tax cuts dependent on EU economic growth will be enough to convince voters, or whether it will backfire as unrealistic.